Bolting an injection mold to platen
I am trying to create a torque value for bolting an injection mold to the press platens. The biggest mold we will hang weighs 42,000lbs. Using the axial load calculator with that weight, 1"-8 threads (4.5" length, 2.5" of thread, 1.5" of thread engagement minimum into press platen, grade 5 or 8 bolts), mold dimensions of 44.75" x 42" x 80".
I calculated that we need 17000 in-lbs of torque to clamp and secure that load using the torque value calculator on this site.
17000 in-lbs = 1416.667 ft-lbs (this would be the force needed to secure the entire mold)(I'm actually going to hang one half at a time, but wanted a very large safety factor)
Using 8 bolts to distribute the load: 1415.667/8 = 177 ft-lbs per bolt. Using additional safety factor of 2.26, I was going to recommend that 400 ft-lbs be used to torque each bolt to safely secure the mold.
Any insight on whether or not the way I approached the problem correctly and any additional guidance would be greatly appreciated!!